यदि $\sin x + \operatorname{cosec} x = 3$ है,तो $\sin^{4} x + \operatorname{cosec}^{4} x$ का मान क्या होगा?

  • A
    $74$
  • B
    $47$
  • C
    $07$
  • D
    $49$

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$\left(4 \cos ^2 \frac{\pi}{20}-1\right)\left(4 \cos ^2 \frac{3 \pi}{20}-1\right)\left(4 \cos ^2 \frac{5 \pi}{20}+1\right)\left(4 \cos ^2 \frac{7 \pi}{20}-1\right)\left(4 \cos ^2 \frac{9 \pi}{20}-1\right)=$

यदि $\sin A + \sin B = x$ और $\cos A + \cos B = y$ है,तो $\sin(A + B) = $

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